ML350 G5 Rackmount & HDD

Hi:I have done a little research for my issue and I didnâ t find anything so, I thought it would be best to open this thread.I would like to buy and install the rack mount kit for my ML350 G5 HP server.The problem is that it works in a vertical position for 3 years and I am a little bit afraid that if I buy the rack mount kit and change the position of my server to horizontal it may appear HDD failure, because the final position of the heeders itâ s going to be completely up side down.My hard drive is a serial scsi 72GB and 146GB.